I have a smart tv and I am using the Apple TV app. When I access the app, the screen is black with no sound. Suggestions?

1. Try restarting the internet equipment (modem, router, switches, Wi-Fi access points, repeaters, mesh nodes, etc.),
2. Try restarting the smart TV,
3. Check for system software updates, and apply if available,
4. Try a delete and re-install of the Apple TV app.

If after all these steps the issue persists, then contact the Apple Support staff for further assistance.